Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time: Thu Mar 17 18:32:26 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger674670
======================================================================
Trigger: 00674670 Segment: 000
BAT Trigger Time: 477624341.568 [s; MET]
Trigger Stop: 477624345.664 [s; MET]
UTC: 2016-02-20T01:25:25.700460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 236.924873803515 Dec: -18.5551027454631 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.35
Image Trigger?: NO
Rate S/N Ratio: 11.3137084989848 [ if not an image trigger ]
Image S/N Ratio: 7.35
Analysis Position: [ source = BAT ]
RA: 236.924873803515 Dec: -18.5551027454631 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 236.940476258743 Dec: -18.5423690981603 [deg; J2000]
{ 15h 47m 45.7s , -18d 32' 32.5" }
+/- 1.7544430005951 [arcmin] (estimated 90% radius based on SNR)
+/- 0.676359342119624 [arcmin] (formal 1-sigma fit error)
SNR: 13.6253605744959
Angular difference between the analysis and refined position is 1.171073 arcmin
Partial Coding Fraction: 0.2773438 [ including projection effects ]
Duration
T90: 8.25999993085861 +/- 1.16642363616434
Measured from: 0.476000010967255
to: 8.73599994182587 [s; relative to TRIGTIME]
T50: 4.5 +/- 1.21395219645737
Measured from: 2.0359999537468
to: 6.5359999537468 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.328000009059906
to: 1.32800000905991 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.100000023841858
to: 8.9879999756813 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.251822 0.319876 0.226948 0.055952
0.041263 0.037924 0.031151 0.025058 [error]
Peak 0.050768 0.050208 0.024173 0.022589
0.013713 0.012786 0.010337 0.009179 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 9.088 -0.100 8.988
T90 8.260 0.476 8.736
T50 4.500 2.036 6.536
Peak 1.000 0.328 1.328
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_index}
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.514 -0.245 0.246 - - - 5.96e-03 -7.94e-04 7.90e-04 39.060 57
CPL -1.509 -0.248 0.428 9999.310 -9999.310 -9999.310 5.98e-03 -5.02e-03 6.74e-03 39.070 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.546 -0.567 0.608 - - - 7.95e-03 -2.38e-03 2.33e-03 67.400 57
CPL -1.558 -1.371 1.332 9999.360 N/A N/A 7.91e-03 N/A N/A 67.400 56
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence PL 7.01e-08 1.28e-07 1.79e-07 5.25e-07 5.13e-07 9.01e-07 erg/cm2
90%_error_low -1.65e-08 -1.84e-08 -3.09e-08 -1.75e-07 -7.36e-08 -2.01e-07 erg/cm2
90%_error_hi 1.76e-08 1.81e-08 3.05e-08 2.30e-07 7.43e-08 2.44e-07 erg/cm2
Peak flux PL 3.42e-01 3.35e-01 2.29e-01 2.47e-01 1.00e+00 1.15e+00 ph/cm2/s
90%_error_low -1.76e-01 -1.14e-01 -8.64e-02 -1.50e-01 -3.07e-01 -3.34e-01 ph/cm2/s
90%_error_hi 2.01e-01 1.07e-01 8.48e-02 2.76e-01 3.10e-01 3.35e-01 ph/cm2/s
Fluence CPL 7.01e-08 1.28e-07 1.79e-07 5.22e-07 5.20e-07 9.14e-07 erg/cm2
90%_error_low N/A N/A N/A N/A -8.14e-08 -3.63e-07 erg/cm2
90%_error_hi N/A N/A N/A N/A 6.66e-08 9.60e-08 erg/cm2
Peak flux CPL 3.54e-01 3.29e-01 2.27e-01 2.52e-01 1.01e+00 1.15e+00 ph/cm2/s
90%_error_low -1.90e-01 -1.08e-01 N/A N/A -3.08e-01 -3.30e-01 ph/cm2/s
90%_error_hi 1.89e-01 1.17e-01 N/A N/A 3.07e-01 3.37e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 236.9405 -18.5424 0.0143 28.7834 99.1988 0.8934490 13.625 TRIG_00674670 Foreground time interval of the image: -0.100 8.988 (delta_t = 9.088 [sec]) Background time interval of the image: -239.568 -0.100 (delta_t = 239.468 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -0.100 sec. to 8.988 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.51366 ( -0.245003 0.245663 ) Norm@50keV : 5.96335E-03 ( -0.000793522 0.000789932 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.06 using 59 PHA bins. # Reduced chi-squared = 0.6853 for 57 degrees of freedom # Null hypothesis probability = 9.666305e-01 Photon flux (15-150 keV) in 9.088 sec: 0.747248 ( -0.102904 0.103523 ) ph/cm2/s Energy fluence (15-150 keV) : 5.1306e-07 ( -7.36013e-08 7.43321e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.100 sec. to 8.988 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.50906 ( -0.248151 0.42805 ) Epeak [keV] : 9999.31 ( -9999.36 -9999.36 ) Norm@50keV : 5.98181E-03 ( -0.00501503 0.00674233 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 39.07 using 59 PHA bins. # Reduced chi-squared = 0.6977 for 56 degrees of freedom # Null hypothesis probability = 9.583980e-01 Photon flux (15-150 keV) in 9.088 sec: 0.754351 ( -0.151221 0.137386 ) ph/cm2/s Energy fluence (15-150 keV) : 5.19623e-07 ( -8.14067e-08 6.66076e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.328 sec. to 1.328 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.54583 ( -0.567037 0.607714 ) Norm@50keV : 7.94608E-03 ( -0.00237699 0.00233403 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.40 using 59 PHA bins. # Reduced chi-squared = 1.182 for 57 degrees of freedom # Null hypothesis probability = 1.630972e-01 Photon flux (15-150 keV) in 1 sec: 1.00474 ( -0.306975 0.30976 ) ph/cm2/s Energy fluence (15-150 keV) : 7.486e-08 ( -2.35998e-08 2.43076e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.328 sec. to 1.328 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.10498 ( -0.823312 1.87888 ) Epeak [keV] : 40.5690 ( ) Norm@50keV : 3.89640E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared = 67.15 using 59 PHA bins. # Reduced chi-squared = 1.199 for 56 degrees of freedom # Null hypothesis probability = 1.461592e-01 Photon flux (15-150 keV) in 1 sec: 1.00939 ( -0.30834 0.30705 ) ph/cm2/s Energy fluence (15-150 keV) : 4.41225e-08 ( 0 0 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 8.26 sec. Hardness ratio (energy fluence ratio) = 1.4009091144
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 1.9782229e-07 S(50-150 keV) = 3.152339e-07
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = -8.782326275476202E-02, IMY = -5.423115040799718E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -239.568000 -0.100000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9802 -15.6553 0.4 23.8 114.0 13.2696 32.3 0.9 Sco X-1 255.9618 -37.8429 0.7 12.4 36.2 3.7859 16.2 1.2 4U 1700-377 256.2400 -36.4584 4.3 11.3 40.6 0.6232 2.7 9.7 GX 349+2 262.8701 -24.6392 3.5 5.3 137.9 0.8510 3.3 9.9 GX 1+4 264.9022 -44.5647 3.8 15.6 -1.6 0.7820 3.1 9.7 4U 1735-44 268.2489 -1.2921 0.0 27.7 178.6 0.6395 2.3 12.0 SW J1753.5-0127 270.1298 -24.9197 0.0 5.3 -145.0 0.4106 1.6 12.7 GX 5-1 270.3586 -25.7773 8.1 4.8 -136.5 0.3629 1.4 3.7 GRS 1758-258 273.9695 -13.9452 4.2 16.6 -158.7 0.7414 2.8 5.9 GX 17+2 276.0984 -30.3965 5.7 8.6 -83.4 0.4889 2.0 9.2 H1820-303 284.9084 -24.7814 7.3 17.0 -105.3 0.4156 1.6 10.9 HT1900.1-2455 288.8143 10.9710 3.7 45.4 -153.7 1.5394 3.1 1.8 GRS 1915+105 263.1454 -34.0023 0.0 5.7 22.4 0.3236 1.3 12.7 GX 354-0 269.0673 -32.2622 3.0 4.0 -39.9 0.8470 3.8 ------ UNKNOWN 299.9739 15.8527 4.5 55.3 -145.1 4.1434 2.6 ------ UNKNOWN 300.2928 15.6489 3.9 55.4 -144.7 4.8967 3.0 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -0.100000 8.988000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 244.9954 -15.7859 4.7 23.7 113.8 0.1257 2.5 8.8 Sco X-1 255.7687 -37.9599 0.0 12.6 36.3 0.0601 1.7 12.4 4U 1700-377 256.6490 -36.3057 0.0 11.0 40.1 0.0766 2.1 12.5 GX 349+2 263.0871 -24.9048 4.6 5.0 138.0 0.0818 2.5 10.5 GX 1+4 264.9221 -44.6064 5.6 15.7 -1.6 0.0695 2.1 12.1 4U 1735-44 268.4304 -1.3748 3.5 27.7 179.0 -0.1336 -3.3 6.0 SW J1753.5-0127 270.2974 -24.9299 19.1 5.3 -143.6 0.0207 0.6 9.0 GX 5-1 270.4657 -25.7921 7.3 4.8 -135.6 -0.0540 -1.6 9.3 GRS 1758-258 273.9743 -14.1434 659.7 16.4 -158.4 0.0006 0.0 6.7 GX 17+2 275.9941 -30.2193 7.4 8.5 -84.6 0.0532 1.6 9.6 H1820-303 285.0487 -24.7761 3.5 17.2 -105.2 -0.1096 -3.3 8.7 HT1900.1-2455 288.8047 10.9352 8.5 45.4 -153.7 -0.0767 -1.4 0.7 GRS 1915+105 262.7887 -33.9610 6.1 5.9 25.1 0.0659 1.9 12.5 GX 354-0 236.9405 -18.5424 0.9 28.8 99.2 0.8935 13.6 ------ UNKNOWN 221.3425 -77.5579 2.3 52.7 5.6 0.6881 4.9 ------ UNKNOWN 282.4116 -3.7667 2.2 29.4 -151.3 0.1988 5.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 371.132600 962.472000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 299.5984 35.1966 0.4 48.7 -28.1 26.3587 30.5 0.5 Cyg X-1 308.1118 40.9924 1.9 40.2 -31.5 3.4405 5.9 2.4 Cyg X-3 325.9562 38.4553 0.0 34.9 -52.8 0.6626 1.1 12.9 Cyg X-2 44.7622 66.5500 3.5 16.0 129.9 1.3904 3.3 ------ UNKNOWN 61.1975 23.4103 3.5 54.1 177.1 5.3771 3.3 ------ UNKNOWN 31.2410 11.8026 5.3 55.3 -145.1 7.5355 2.4 ------ UNKNOWN 30.9579 11.7329 4.8 55.3 -144.7 9.1539 2.9 ------ UNKNOWN